<!DOCTYPE html>
<html lang="en">
 <head>
      <meta charset="UTF-8" />
     <title>Title</title>
     </head>
 <body>
  <form action="#" method="post">
 <p>
<!-- requeird必填字段-->
 <span>银行账号：</span>
 <input type="text" id="fdBKAccountnum" required />

 </p >
 <!-- <button type="button" onclick="Trim()">提交</button>-->
  </form>
  <script>
      window.onload = function () {
          var BA = document.getElementById('fdBKAccountnum')
          $("input[name='name=\"extendDataFormInfo.value(fdBKAccountnum)\"']")
          BA.onkeypress = function () {
              if (event.keyCode == 32) {
                  // alert('不能输入空格')
                  event.returnValue = false
              }
          }
          BA.onkeyup = function () {
              // alert('不能输入空格')
              this.value = this.value.replace(/[, ]/g, '')
          }
      }
  </script>
 </body>
</html>